IC697MEM735 GE Memory Expander Series 90-70 Available in 128 256 Kbytes

• MEMORY EXPANDER
• SERIES 90-70
• AVAILABLE IN 128/256 KBYTES
• W/256 KBYTES NON-VOLATILE FLASH MEMORY

The IC697MEM735 is a scalable CPU module developed by GE Fanuc. It is engineered to boost the data and logic memory capacity of compatible CPU modules, including the 780, 781, 782, 788, and 789 series. It comes in configurations of 128 KB, 256 KB (which includes an extra 256 KB of non-volatile flash memory), and 512 KB, making it a useful tool for applications that demand extensive memory expansion. Installed directly onto the CPU module as a daughter card, it uses a dedicated memory expansion slot. Its compact, integrated design simplifies installation and avoids taking up additional rack slots.

• Critical Memory Provision: Since many GE Fanuc Series 90-70 CPUs lack internal RAM, this module serves as a key component, providing the primary working memory needed for logic execution and data storage.
• Battery-Backed RAM: When power is lost, the module relies on the CPU's onboard battery to preserve volatile memory content (SRAM). This enables the controller to return to normal operation without data loss once power is restored.
• Flash Memory Capability: The 256 KB version includes non-volatile flash memory, allowing users to store critical data that must survive both power outages and battery failure. Flash memory is well-suited for retaining configuration files, setpoints, and fault history.
• Error Detection & Integrity Checks: The CPU constantly monitors memory health through checksum validation and parity error detection across the SRAM. These features help prevent undetected data corruption and ensure consistent system performance.

Proper power management during installation is vital for equipment safety and data integrity:

Pre-Installation Safety Measures:

• Before installing the module, turn off the rack power to prevent short circuits or electrical damage.
• Precisely align the connectors between the CPU and the memory module.
• Use the provided screws and standoffs to securely fasten the module, ensuring both mechanical and electrical stability.

Post-Installation Steps:

• After firmly mounting the CPU and memory module into the rack, restore power to the system.
• The memory can then be cleared or initialized using GE Fanuc's programming software, which is compatible with both Windows and MS-DOS environments.
• Clear instructions and commands within the software guarantee safe configuration and memory verification.

Battery Type: The system uses the ACC701 lithium battery, which not only preserves memory but also powers the CPU's real-time clock/calendar.

Battery Replacement Guidelines: To prevent data loss, always install the new battery before removing the old one. This ensures uninterrupted power to the SRAM, maintaining both memory content and timekeeping functions. Routine battery inspections and preventive replacement schedules are recommended, especially in critical applications like power generation, chemical processing, or transportation control.

• Preparation Steps: Ensure the rack power is off before starting the installation.
• Aligning Components: Line up the connectors on the expansion memory board with those on the CPU. Position the captive screws on the expansion memory board to match the pre-installed standoffs on the CPU.
• Mount the Expansion Memory Board: Carefully push the expansion memory board onto the CPU connector, making sure the screws remain aligned with their respective standoffs.
• Tighten the Screws: Use a #1 Phillips screwdriver to firmly tighten each screw of the expansion memory board into the standoffs.
• Install the CPU Module: With the rack power still off, place the CPU module into its designated slot in the rack.
• Power On & Clear Memory: Once installation is complete, turn on the rack power. To clear the memory, use compatible programming software (such as MS-DOS or Windows) and follow the detailed instructions in the Programming Software User's Manual.